CN114269045A - LED silicon controlled rectifier dimming power supply - Google Patents
LED silicon controlled rectifier dimming power supply Download PDFInfo
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- CN114269045A CN114269045A CN202111511390.5A CN202111511390A CN114269045A CN 114269045 A CN114269045 A CN 114269045A CN 202111511390 A CN202111511390 A CN 202111511390A CN 114269045 A CN114269045 A CN 114269045A
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- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 75
- 239000010703 silicon Substances 0.000 title claims abstract description 75
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- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 3
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Abstract
The invention relates to an LED silicon controlled rectifier dimming power supply, which comprises a silicon controlled rectifier dimming control circuit and a power output circuit, wherein the power output circuit comprises a silicon controlled rectifier, the silicon controlled rectifier dimming control circuit comprises a control chip U6, the control chip U6 comprises an input end and a first output end, the silicon controlled rectifier dimming control circuit also comprises a main dummy load connected between the first output end of the control chip U6 and the silicon controlled rectifier and an auxiliary dummy load connected between the input end of the control chip U6 and the silicon controlled rectifier, the control chip U6 reads tangential angle signals of the silicon controlled rectifier in the power output circuit in real time, the auxiliary dummy load is used for stabilizing the silicon controlled rectifier and stabilizing phase angle detection of the control chip U6, the stability of the phase angle detection is improved, the phase angle detection precision is improved, and after the auxiliary dummy load is added, the complexity of a control program can be reduced.
Description
Technical Field
The invention relates to the technical field of lamp dimming systems, in particular to an LED silicon controlled rectifier dimming power supply.
Background
For the illumination field, the silicon controlled phase control (chopper method) dimming method has the advantages of small volume, reasonable price and wide dimming power range, so the silicon controlled phase control dimming method is the most widely applied dimming method at present and is widely applied to the field of stage illumination and environmental illumination. By applying the silicon controlled rectifier phase control working principle and controlling the conduction angle of a silicon controlled rectifier element, a part of sine wave voltage input by an alternating current power grid is cut off so as to reduce the average value of output voltage, thereby controlling the power supply voltage of a lamp circuit and realizing the dimming function of a lamp load.
The size that current LED silicon controlled rectifier was adjusted luminance power acts on the silicon controlled rectifier through changing a set of silicon controlled rectifier dummy load, and the purpose makes the voltage after passing through the silicon controlled rectifier remain stable, guarantees that the silicon controlled rectifier has stable tangential angle, and there is following defect in this kind of structure: the size of a group of dummy loads of the controllable silicon acts on the controllable silicon to influence the phase angle detection of the single chip microcomputer, so that the phase angle detection is unstable, the phase angle detection precision is poor, the corresponding program for controlling the dummy loads is abnormal and complex, and the complexity of the whole LED controllable silicon dimming power supply is increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the LED silicon controlled rectifier dimming power supply which can improve the stability of phase angle detection, improve the phase angle detection precision and simplify the control program.
The technical scheme includes that the LED silicon controlled rectifier dimming power supply comprises a silicon controlled rectifier dimming control circuit and a power output circuit, wherein the power output circuit comprises a silicon controlled rectifier, the silicon controlled rectifier dimming control circuit comprises a control chip U6, the control chip U6 comprises an input end and a first output end, the silicon controlled rectifier dimming control circuit further comprises a main dummy load connected between the first output end of the control chip U6 and the silicon controlled rectifier, and an auxiliary dummy load connected between the input end of the control chip U6 and the silicon controlled rectifier.
The invention has the beneficial effects that: by adopting the LED silicon controlled rectifier dimming power supply with the structure, the control chip U6 reads the tangential angle signal of the silicon controlled rectifier in the power output circuit in real time, and the auxiliary dummy load connected between the input end of the control chip U6 and the silicon controlled rectifier can play two roles, one is to stabilize the silicon controlled rectifier; the other is to stabilize the phase angle detection of the control chip U6, improve the stability of the phase angle detection, improve the phase angle detection precision, and reduce the complexity of the control program after adding the auxiliary dummy load; the output end of the control chip U6 outputs a PWM signal to pass through the main dummy load, the PWM signal acts on the controlled silicon by changing the size of the main dummy load so that the voltage passing through the controlled silicon is kept stable, and the controlled silicon is ensured to have a stable tangential angle.
Preferably, the thyristor dimming control circuit further comprises a rectifier bridge DB2, an input end of the rectifier bridge DB2 is connected with the thyristor, an input end of the control chip U6 is connected with an output end of the rectifier bridge DB2, one end of an auxiliary dummy load is connected with an output end of the rectifier bridge DB2, the other end of the auxiliary dummy load is grounded, the auxiliary dummy load comprises a control device Q7 and a control device Q11 connected with the control device Q7, with the structure, the rectifier bridge DB2 collects a tangential angle signal of the thyristor in the power output circuit in real time and inputs the tangential angle signal into the control chip U6, and the auxiliary dummy load is connected between the output end of the rectifier bridge DB2 and the input end of the control chip U6 in parallel, on one hand, in order to stabilize the thyristor; the more important reason is to stabilize the phase angle detection of the control chip U6, improve the stability of the phase angle detection, improve the phase angle detection precision, and reduce the complexity of the control program after adding the auxiliary dummy load.
Preferably, the main dummy load comprises a control device Q12, one end of the control device Q12 is connected with the output end of the control chip U6, the other end of the control device Q12 is connected with the power output circuit, and by adopting the structure, the output end of the control chip U6 outputs a PWM signal to pass through the main dummy load, the size of the main dummy load is changed by controlling the conduction of the control device Q12, so that the PWM signal acts on the controllable silicon, the voltage passing through the controllable silicon is kept stable, and the controllable silicon is ensured to have a stable tangential angle.
Preferably, the control chip U6 further includes a second output end, the LED scr dimming power supply further includes a power control circuit coupled to the second output end of the control chip U6, a switching bar CON3 connected between the power control circuit and the power output circuit, and a range expansion module connected to the switching bar CON3, one end of the range expansion module is connected to the power output circuit, and the other end is connected to the power control circuit through the switching bar CON 3.
Preferably, the second output terminal of the control chip U6 is coupled to a power control circuit through an optical coupler U4A, the power control circuit includes a follower U3 and a comparator U1B connected to the follower U3, the range switching module includes a dial switch SW1, a resistor R73 connected to the dial switch SW1, and a resistor R74 connected to the dial switch SW1, the dial switch SW1 is connected to the power output circuit through the resistor R73 and the resistor R74, the dial switch SW1 is connected between the follower U3 and the comparator U1B through a switching row CON3, and with this structure, the range of the LED scr dimming power supply is extended through the dial switch SW1, the resistor R73, and the resistor R74, the upper limit of the dimming range is extended, and the function of the LED scr dimming power supply is enhanced.
Preferably, the LED silicon controlled rectifier dimming power supply further comprises a power feedback circuit for acquiring a current feedback signal output by the power output circuit in real time, the control chip U6 comprises a power supply terminal VDD, the silicon controlled rectifier dimming control circuit further comprises a voltage turn-off module connected with the power supply terminal VDD, the voltage turn-off module comprises an optocoupler U7B, a control device Q4 connected with the optocoupler U7B, a control device Q5 connected with the control device Q4, a diode D8A connected with the control device Q5, and a three-terminal regulator Q6 connected with the diode D8A, the three-terminal regulator Q6 is connected with the power supply terminal VDD of the control chip U6, the voltage turn-off module is coupled with the power feedback circuit through the optocoupler U7B, with the structure, the power feedback circuit is used for acquiring the current feedback signal output by the power output circuit in real time, the power feedback circuit acts on the optocoupler U7B, the optocoupler U7B controls the control device Q4, the control device Q4 controls the control device Q5, the control device Q5 controls the three-terminal voltage regulator Q6, and finally acts on the control chip U6 to supply power to the control chip U6; when the output of the power output circuit is in no-load, the power feedback circuit acts on the optocoupler U7B, the optocoupler U7B controls the control device Q4 and the control device Q5 to be in a cut-off state, the three-terminal regulator Q6 is not switched on, and the power supply end VDD cannot supply power, namely the control chip U6 does not work, so that when the output is in no-load, the no-load power consumption is greatly reduced, and the energy is saved.
Drawings
FIG. 1 is a block diagram of a circuit control structure of an LED silicon controlled dimming power supply of the invention;
FIG. 2 is a block diagram of a circuit structure of the LED silicon controlled rectifier dimming power supply of the invention;
FIG. 3 is a block diagram of a circuit for adjusting the dimming range according to the present invention;
FIG. 4 is a block diagram of the circuit structure of the SCR dimming control circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of a thyristor dimming control circuit according to the present invention;
FIG. 6 is a circuit schematic of a power output circuit of the present invention;
FIG. 7 is a circuit schematic of the power control circuit of the present invention;
FIG. 8 is a circuit schematic of the power feedback circuit of the present invention;
as shown in the figure: 1. silicon controlled rectifier; 2. a primary dummy load; 3. auxiliary dummy load; 4. a control chip U6; 5. an input end; 6. a first output terminal; 7. a second output terminal; 8. a power control circuit; 9. a silicon controlled dimming control circuit; 10. a power output circuit; 11. a power feedback circuit; 12. a range expansion module; 13. switching row CON 3; 14. a power supply terminal VDD; 15. and a voltage shutdown module.
Detailed Description
The invention is further described below with reference to the accompanying drawings in combination with specific embodiments so that those skilled in the art can practice the invention with reference to the description, and the scope of the invention is not limited to the specific embodiments.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms should not be construed as limiting the present invention.
The invention relates to an LED silicon controlled rectifier 1 dimming power supply, which comprises a silicon controlled rectifier 1 dimming control circuit and a power output circuit 10 as shown in figure 2, wherein the power output circuit 10 comprises a silicon controlled rectifier 1, the silicon controlled rectifier 1 dimming control circuit comprises a control chip U64, the control chip U64 comprises an input end 5 and a first output end 6, the silicon controlled rectifier 1 dimming control circuit also comprises a main dummy load 2 connected between the first output end 6 of the control chip U64 and the silicon controlled rectifier 1, and an auxiliary dummy load 3 connected between the input end 5 of the control chip U64 and the silicon controlled rectifier 1.
In the LED thyristor 1 dimming power supply with the structure of fig. 1, the control chip U64 reads the tangential angle signal of the thyristor 1 in the power output circuit 10 in real time, and the auxiliary dummy load 3 connected between the input terminal 5 of the control chip U64 and the thyristor 1 can play two roles, one is to stabilize the thyristor 1; the other is to stabilize the phase angle detection of the control chip U64, improve the stability of the phase angle detection, improve the phase angle detection precision, and reduce the complexity of the control program after adding the auxiliary dummy load 3; the output end of the control chip U64 outputs a PWM signal to pass through the main dummy load 2, the PWM signal acts on the controlled silicon 1 by changing the size of the main dummy load 2, so that the voltage passing through the controlled silicon 1 is kept stable, and the controlled silicon 1 is ensured to have a stable tangential angle.
As shown in fig. 5, the thyristor 1 dimming control circuit further includes a rectifier bridge DB2, and the input terminals 5AC1 and AC2 of the rectifier bridge DB2 are connected to the corresponding ports AC1 and AC2 in fig. 6, that is, the input terminal 5 of the rectifier bridge DB2 is connected to the thyristor 1 in the power output circuit 10, and in fig. 6, RT1 represents the thyristor 1; as shown in fig. 5, the input terminal 5 of the control chip U64 is connected to the output terminal of the rectifier bridge DB2, one end of the auxiliary dummy load 3 is connected to the output terminal of the rectifier bridge DB2, and the other end is grounded, the auxiliary dummy load 3 includes a control device Q7 and a control device Q11 connected to the control device Q7, with this structure, the rectifier bridge DB2 collects the tangential angle signal of the thyristor 1 in the power output circuit 10 in real time and inputs the tangential angle signal into the control chip U64, the auxiliary dummy load 3 is connected in parallel between the output terminal of the rectifier bridge DB2 and the input terminal 5 of the control chip U64, on one hand, in order to stabilize the thyristor 1; the more important reason is to stabilize the phase angle detection of the control chip U64, improve the stability of the phase angle detection, improve the phase angle detection precision, and reduce the complexity of the control program after the auxiliary dummy load 3 is added.
As shown in fig. 5, the main dummy load 2 includes a control device Q12, one end of the control device Q12 is connected to the output end of the control chip U64, and the other end is connected to the power output circuit 10, in fig. 5, the output end of the control chip U64 outputs a PWM1 signal through the main dummy load 2, a node HV in fig. 5 is connected to a position of the node HV in fig. 6, and the signal enters the power output circuit 10 after passing through the main dummy load 2, so that the control chip U64 controls the conduction of the control device Q12 to change the size of the main dummy load 2, thereby acting on the thyristor 1, so that the voltage passing through the thyristor 1 is kept stable, and the thyristor 1 is guaranteed to have a stable tangential angle.
As shown in fig. 1, the control chip U64 further includes a second output end 7, the LED scr 1 dimming power supply further includes a power control circuit 8 coupled to the second output end 7 of the control chip U64, as shown in fig. 3, the LED scr 1 dimming power supply further includes a switching row CON313 connected between the power control circuit 8 and the power output circuit 10, and a range expansion module 12 connected to the switching row CON313, one end of the range expansion module 12 is connected to the power output circuit 10, and the other end is connected to the power control circuit 8 through the switching row CON313, and the range expansion module 12 expands the range of the LED scr 1 dimming power supply, so as to expand the upper limit of the dimming range, and make the function of the LED scr 1 dimming power supply more powerful.
As shown in fig. 5, the second output terminal 7 of the control chip U64 is coupled to the power control circuit 8 through an optical coupler U4A, as shown in fig. 7, the power control circuit 8 includes a follower U3 and a comparator U1B connected to the follower U3, as shown in fig. 6, the range switching module includes a dial switch SW1, a resistor R73 connected to a dial switch SW1, and a resistor R74 connected to the dial switch SW1, the dial switch SW1 is connected to the power output circuit 10 through the resistor R73 and the resistor R74, as shown in fig. 6, the dial switch SW1 is connected between the follower U3 and the comparator U1B through a third pin of the switching row CON313, and with this structure, the range of the triac SW1, the resistor R73, and the resistor R74 is extended, so that the upper limit of the dimming range of the LED 1 is extended and the function of the triac dimming power supply is more powerful.
As shown in fig. 2, the LED scr 1 dimming power supply further includes a power feedback circuit 11 for acquiring a current feedback signal output from the power output circuit 10 in real time, as shown in fig. 4, the control chip U64 includes a power terminal VDD14, the scr 1 dimming control circuit further includes a voltage turn-off module 15 connected to the power terminal VDD14, as shown in fig. 5, the voltage turn-off module 15 includes an optocoupler U7B, a control device Q4 connected to the optocoupler U7B, a control device Q5 connected to the control device Q4, a diode D8A connected to the control device Q5, and a three-terminal Q6 connected to the diode D8A, the three-terminal Q6 is connected to the power terminal VDD14 of the control chip U64, the voltage turn-off module 15 is coupled to the power feedback circuit 11 through the optocoupler U7B, the power feedback circuit 11 is used for acquiring a current feedback signal output from the power output circuit 10 in real time, and the power feedback circuit 11 acts on the optocoupler U7B, the optocoupler U7B controls the control device Q4, the control device Q4 controls the control device Q5, the control device Q5 controls the three-terminal voltage regulator Q6, and finally acts on the control chip U64 to supply power to the control chip U64; when the output of the power output circuit 10 is in no-load, the power feedback circuit 11 acts on the optocoupler U7B, the optocoupler U7B controls the control device Q4 and the control device Q5 to be in a cut-off state, the three-terminal regulator Q6 is not switched on, and the power supply end VDD14 cannot supply power, namely the control chip U64 does not work, so that when the output is in no-load, the no-load power consumption is greatly reduced, and the energy is saved.
Claims (6)
- LED silicon controlled rectifier power of adjusting luminance, including silicon controlled rectifier (1) dimming control circuit and power output circuit (10), power output circuit (10) are including silicon controlled rectifier (1), and silicon controlled rectifier (1) dimming control circuit includes control chip U6(4), its characterized in that: the control chip U6(4) includes input (5) and first output (6), and silicon controlled rectifier (1) dimming control circuit is still including connecting main dummy load (2) between the first output (6) of control chip U6(4) and silicon controlled rectifier (1) and connecting supplementary dummy load (3) between input (5) and silicon controlled rectifier (1) of control chip U6 (4).
- 2. The LED silicon controlled rectifier dimming power supply of claim 1, wherein: silicon controlled rectifier (1) dimming control circuit still includes rectifier bridge DB2, input (5) and the silicon controlled rectifier (1) of rectifier bridge DB2 are connected, input (5) and rectifier bridge DB 2's of control chip U6(4) output are connected, assist dummy load (3) one end and rectifier bridge DB 2's output and be connected, other end ground connection, assist dummy load (3) including controlling means Q7 and the controlling means Q11 of being connected with controlling means Q7.
- 3. The LED silicon controlled rectifier dimming power supply of claim 2, wherein: the main dummy load (2) comprises a control device Q12, one end of the control device Q12 is connected with the output end of the control chip U6(4), and the other end is connected with the power output circuit (10).
- 4. The LED silicon controlled rectifier dimming power supply of claim 1, wherein: the control chip U6(4) further comprises a second output end (7), the LED silicon controlled rectifier (1) dimming power supply further comprises a power control circuit (8) coupled with the second output end (7) of the control chip U6(4), a switching bar CON3(13) connected between the power control circuit (8) and the power output circuit (10), and a range expansion module (12) connected with the switching bar CON3(13), one end of the range expansion module (12) is connected with the power output circuit (10), and the other end of the range expansion module is connected with the power control circuit (8) through the switching bar CON3 (13).
- 5. The LED silicon controlled rectifier dimming power supply of claim 4, wherein: the second output end (7) of the control chip U6(4) is coupled with a power control circuit (8) through an optical coupler U4A, the power control circuit (8) comprises a follower U3 and a comparator U1B connected with the follower U3, the measuring range switching module comprises a dial switch SW1, a resistor R73 connected with a dial switch SW1 and a resistor R74 connected with the dial switch SW1, the dial switch SW1 is connected with the power output circuit (10) through a resistor R73 and a resistor R74, and the dial switch SW1 is connected between the follower U3 and the comparator U1B through a changeover row CON3 (13).
- 6. The LED silicon controlled rectifier dimming power supply of claim 1, wherein: the LED silicon controlled rectifier (1) dimming power supply further comprises a power feedback circuit (11) which collects current feedback signals output in the power output circuit (10) in real time, a control chip U6(4) comprises a power supply end VDD (14), the silicon controlled rectifier (1) dimming control circuit further comprises a voltage turn-off module (15) connected with the power supply end VDD (14), the voltage turn-off module (15) comprises an optocoupler U7B, a control device Q4 connected with the optocoupler U7B, a control device Q5 connected with the control device Q4, a diode D8A connected with the control device Q5 and a three-terminal regulator Q6 connected with the diode D8A, the three-terminal regulator Q6 is connected with the power supply end VDD (14) of the control chip U6(4), and the voltage turn-off module (15) is coupled with the power feedback circuit (11) through the optocoupler U7B.
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| CN202111511390.5A CN114269045B (en) | 2021-12-06 | 2021-12-06 | LED silicon controlled rectifier dimming power supply |
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| CN202111511390.5A CN114269045B (en) | 2021-12-06 | 2021-12-06 | LED silicon controlled rectifier dimming power supply |
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| CN114269045B CN114269045B (en) | 2024-04-02 |
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| CN206212339U (en) * | 2016-11-02 | 2017-05-31 | 深圳市金流明光电技术有限公司 | A kind of thyristor regulating photocontrol circuit and LED lamp system |
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| CN101404840A (en) * | 2008-11-04 | 2009-04-08 | 梁莉丽 | Two-wire system light-adjustable LED controller |
| CN103917001A (en) * | 2012-12-31 | 2014-07-09 | 比亚迪股份有限公司 | Switching power supply, control method for switching power supply, and control chip |
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